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Angiotensin II acting on brain AT1 receptors induces adrenaline secretion and pressor responses in the rat.

TitleAngiotensin II acting on brain AT1 receptors induces adrenaline secretion and pressor responses in the rat.
Publication TypeJournal Article
Year of Publication2014
AuthorsNakamura, K., Shimizu T., Yanagita T., Nemoto T., Taniuchi K., Shimizu S., Dimitriadis F., Yawata T., Higashi Y., Ueba T., & Saito M.
JournalSci Rep
Volume4
Pagination7248
Date Published2014 Nov 28
ISSN2045-2322
KeywordsAdrenal Medulla, Angiotensin II, Angiotensin II Type 1 Receptor Blockers, Animals, Blood Pressure, Brain, Epinephrine, Injections, Intraventricular, Male, Norepinephrine, Rats, Rats, Wistar, Receptor, Angiotensin, Type 1, Tetrazoles, Valine, Valsartan
Abstract

Angiotensin II (AngII) plays important roles in the regulation of cardiovascular function. Both peripheral and central actions of AngII are involved in this regulation, but mechanisms of the latter actions as a neurotransmitter/neuromodulator within the brain are still unclear. Here we show that (1) intracerebroventricularly (i.c.v.) administered AngII in urethane-anesthetized male rats elevates plasma adrenaline derived from the adrenal medulla but not noradrenaline with valsartan- (AT1 receptor blocker) sensitive brain mechanisms, (2) peripheral AT1 receptors are not involved in the AngII-induced elevation of plasma adrenaline, although AngII induces both noradrenaline and adrenaline secretion from bovine adrenal medulla cells, and (3) i.c.v. administered AngII elevates blood pressure but not heart rate with the valsartan-sensitive mechanisms. From these results, i.c.v. administered AngII acts on brain AT1 receptors, thereby inducing the secretion of adrenaline and pressor responses. We propose that the central angiotensinergic system can activate central adrenomedullary outflow and modulate blood pressure.

DOI10.1038/srep07248
Alternate JournalSci Rep
PubMed ID25431019
PubMed Central IDPMC5384216

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